If you just want to filter out a positional part of the output you do not need awk at all:
will break down the output and assign word 1 to var1, word 2 to var2 and so on. If there are more words than variables the last variable will get the remainder of the line. You can use a dummy variable over and over again to filter out what you are not interested in:
example (filter out the size only):
Your code could be simplified to (adjust the number of "junk"s to adapt to your systems output):
Hi,
I have got a little problem where some of the files I created had some funny characters e.g space ,"^M" etc inserted in the full file name and which caused our backup script to skip those files.
Is it possible to find out if there are any funny charaters in a string ?
Thanks, (4 Replies)
Hi,
One silly question. I would like to add statement like below and append to a file. I used the below code; however, it does not work. Can anyone please tell me what mistakes I have made?
awk '
{ for (i=1;i<=563;i++)
print i
}'>>output.txt
Thanks.
-Jason (1 Reply)
ive input file contains to clums a and b spreated by pipe
a | b
123|456
323|455
and
xyz contains other info about a and b
now i want to print as follows:
a | b | "info from xyz"
but "info from xyz" might be more than 1 line and i want to keep the format to 3 cloums.
how to do it?... (3 Replies)
Hi, I'm using a while-loop in an awk script. If it matches a regular expression, it prints a line. Unfortunately, each line that is printed in this loop is followed by an extra character, "1".
While-statement extracted from my script:
getline temp;
while (temp ~ /.* x .*/) print temp... (3 Replies)
for VGLIST in `lsvg -o`
do
CLOSED_OUT=`echo $VGLIST | lsvg -l $VGLIST | awk '{print $6 " " $7}' | grep closed`
if ]; then
echo "Filesystems $CLOSED_OUT in VG that are in Closed status"
else
echo "\n Some message"
fi
Above Code is working fine, but echo "Filesystems $CLOSED_OUT... (8 Replies)
I have a file contains data with non-printing characters. i have used cat -v filename to display whole data with non-printing characters also.
However, i need lines with non-printing characters into seperate file. My file is huge and looks like i have to manully find lines using cat -v filename |... (3 Replies)
Hello!
I'm making an English to Morse Code translator and I was able to mostly get it all working by looking through older posts here; however, I have one small problem.
When I run it it's just printing spaces for where the characters should be. It runs the right amount of times, and if I try... (3 Replies)
I like to “optimize” / make more like a real program my bash script by replacing repetitious code which utilizes positional parameters.
I am having two issues I cannot solve and would appreciate some assistance with resolving them.
a) how to modify the whiptail checklist... (3 Replies)
So I am writing a bash script that will search a file line by line for unix timestamps, store all of the timestamps into an array, then check how many of those timestamps were created within the last hour, and finally increment a counter every time it finds a timestamp created within the last hour.... (6 Replies)
Discussion started by: jsikarin
6 Replies
LEARN ABOUT MINIX
libnetlink
libnetlink(3) Library Functions Manual libnetlink(3)NAME
libnetlink - A library for accessing the netlink service
SYNOPSIS
#include <asm/types.h>
#include <libnetlink.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions)
int rtnl_wilddump_request(struct rtnl_handle *rth, int family, int type)
int rtnl_send(struct rtnl_handle *rth, char *buf, int len)
int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len)
int rtnl_dump_filter(struct rtnl_handle *rth,
int (*filter)(struct sockaddr_nl *, struct nlmsghdr *n, void *),
void *arg1,
int (*junk)(struct sockaddr_nl *,struct nlmsghdr *n, void *),
void *arg2)
int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer,
unsigned groups, struct nlmsghdr *answer,
int (*junk)(struct sockaddr_nl *,struct nlmsghdr *n, void *),
void *jarg)
int rtnl_listen(struct rtnl_handle *rtnl,
int (*handler)(struct sockaddr_nl *, struct rtnl_ctrl_data *,
struct nlmsghdr *n, void *),
void *jarg)
int rtnl_from_file(FILE *rtnl,
int (*handler)(struct sockaddr_nl *,struct nlmsghdr *n, void *),
void *jarg)
int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data)
int addattr_l(struct nlmsghdr *n, int maxlen, int type, void *data, int alen)
int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data)
int rta_addattr_l(struct rtattr *rta, int maxlen, int type, void *data, int alen)
DESCRIPTION
libnetlink provides a higher level interface to rtnetlink(7). The read functions return 0 on success and a negative errno on failure. The
send functions return the amount of data sent, or -1 on error.
rtnl_open
Open a rtnetlink socket and save the state into the rth handle. This handle is passed to all subsequent calls. subscriptions is a
bitmap of the rtnetlink multicast groups the socket will be a member of.
rtnl_wilddump_request
Request a full dump of the type database for family addresses. type is a rtnetlink message type.
rtnl_dump_request
Request a full dump of the type data buffer into buf with maximum length of len. type is a rtnetlink message type.
rtnl_dump_filter
Receive netlink data after a request and filter it. The filter callback checks if the received message is wanted. It gets the
source address of the message, the message itself and arg1 as arguments. 0 as return means that the filter passed, a negative value
is returned by rtnl_dump_filter in case of error. NULL for filter means to not use a filter. junk is used to filter messages not
destined to the local socket. Only one message bundle is received. If there is a message pending, this function does not block.
rtnl_listen
Receive netlink data after a request and pass it to handler. handler is a callback that gets the message source address, anscillary
data, the message itself, and the jarg cookie as arguments. It will get called for all received messages. Only one message bundle
is received. If there is a message pending this function does not block.
rtnl_from_file
Works like rtnl_listen, but reads a netlink message bundle from the file file and passes the messages to handler for parsing. The
file should contain raw data as received from a rtnetlink socket.
The following functions are useful to construct custom rtnetlink messages. For simple database dumping with filtering it is better to use
the higher level functions above. See rtnetlink(3) and netlink(3) on how to generate a rtnetlink message. The following utility functions
require a continuous buffer that already contains a netlink message header and a rtnetlink request.
rtnl_send
Send the rtnetlink message in buf of length len to handle rth.
addattr32
Add a __u32 attribute of type type and with value data to netlink message n, which is part of a buffer of length maxlen.
addattr_l
Add a variable length attribute of type type and with value data and alen length to netlink message n, which is part of a buffer of
length maxlen. data is copied.
rta_addattr32
Initialize the rtnetlink attribute rta with a __u32 data value.
rta_addattr32
Initialize the rtnetlink attribute rta with a variable length data value.
BUGS
This library is meant for internal use, use libmnl for new programs.
The functions sometimes use fprintf and exit when a fatal error occurs. This library should be named librtnetlink.
AUTHORS
netlink/rtnetlink was designed and written by Alexey Kuznetsov. Andi Kleen wrote the man page.
SEE ALSO netlink(7), rtnetlink(7)
/usr/include/linux/rtnetlink.h
libnetlink(3)